package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.mapper.DishMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl extends ServiceImpl<DishMapper, Dish> implements DishService {

    @Autowired
    private DishFlavorService dishFlavorService;

    @Transactional
    public void saveWithFlavor(DishDto dishDto) {

        // 保存菜品的基本信息到菜品表dish
        // 保存成功后，会生成id然后赋值给dishDto，然后通过dishDto.getId();可以获取id值
        this.save(dishDto);

        Long dishId = dishDto.getId();
        // 菜品口味
        List<DishFlavor> flavors = dishDto.getFlavors();

        // 菜品口味应该绑定对应菜品的id值。
        flavors = flavors.stream().map((item) -> {
           item.setDishId(dishId);
           return item;
        }).collect(Collectors.toList());

        dishFlavorService.saveBatch(flavors);
    }

    public DishDto getByIdWithFlavor(Long id) {
        // 根据id查询到对应菜品类Dish
        Dish dish = this.getById(id);
        // 根据Dish获取所有对应的List<DishFlavor>
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId, dish.getId());
        List<DishFlavor> list = dishFlavorService.list(queryWrapper);
        // 类拷贝
        DishDto dishDto = new DishDto();
        BeanUtils.copyProperties(dish, dishDto);
        // 将list加入DishDto
        dishDto.setFlavors(list);
        return dishDto;
    }

    @Override
    @Transactional
    public void updateWithFlavor(DishDto dishDto) {
        // 更新菜品信息
        this.updateById(dishDto);
        // 获取菜品信息id，由id将对应的菜品信息删除
        LambdaQueryWrapper<DishFlavor> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(DishFlavor::getDishId, dishDto.getId());
        dishFlavorService.remove(queryWrapper);
        // 将id填充到新的菜品风味中
        List<DishFlavor> flavors = dishDto.getFlavors();
        flavors.stream().map((item) -> {
            item.setDishId(dishDto.getId());
            return item;
        }).collect(Collectors.toList());
        // 再次添加到风味表中
        dishFlavorService.saveBatch(flavors);
    }
}
